TORONTO — The chief executive of struggling BlackBerry-maker Research In Motion apologized Friday after an outage in Europe and Africa interrupted service for customers on the very day Apple Inc. released its new iPhone 5.

RIM announced the issues in postings on Facebook and Twitter on Friday, and later said it resolved the issue. The service disruption lasted up to three hours for some BlackBerry users.

The outage brought up unpleasant memories of last year’s troubles with emails and chat messages that left many users bereft for up to three days.

The timing could not have been worse, coming as lines formed outside of Apple stores in a number of cities as the new iPhone 5 went on sale.

RIM shares plunged 6.5 percent, or 45 cents, to $6.45 in trading on the Nasdaq.

Chief Executive Thorsten Heins said up to 6 percent of RIM’s users may have been affected. He said the company is conducting a full analysis and will report back. No reason for the outage was given.

“I want to apologize to those BlackBerry customers in Europe and Africa who experienced an impact in their quality of service earlier this morning. The BlackBerry service is now fully restored and I can report that no data or messages were lost,” Heins said in a statement posted on RIM’s website. “Preliminary analysis suggests that those customers may have experienced a maximum delay of 3 hours in the delivery and reception of their messages.”

RIM initially said the outage included the Middle East, but RIM spokeswoman Amy Jones later said it did not.

“It’s the worst timing,” Jefferies analyst Peter Misek said. “This is bad publicity and it’s very unfortunate. But frankly the attention is all going to be on Apple today, all the weekend and frankly until the end of the year. Frankly, it’s kind of irrelevant. The only thing that’s relevant is when they are going to come out with their new phones.”

Misek said he thinks the transition to the BlackBerry 10 software intended to run their new line of smartphones, could be a cause of the outage. RIM is preparing to launch the new phones early next year, after a series of delays.

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